Question

A SysOps administrator is configuring Amazon Cloudwatch Alarms. A particular is constantly in the Alarm state.

What could be the reason for this issue?

A. Alarms continue to evaluate metrics against configured thresholds, even after they are triggered.
B. After alarms are triggered, they remain in the ALARM state until they are manually disabled.
C. After an alarm is triggered and an action is performed, the application logic must reset the alarm to its normal state.
D. The alarm is not receiving appropriate metrics.

Answer

C. After an alarm is triggered and an action is performed, the application logic must reset the alarm to its normal state.

Explanation

The reason for a CloudWatch alarm constantly being in the ALARM state could be:

Option C: After an alarm is triggered and an action is performed, the application logic must reset the alarm to its normal state.

Here’s a detailed explanation of why option C is the correct choice:

• When an alarm is triggered in CloudWatch, it enters the ALARM state and starts executing the actions defined for that alarm. These actions could include sending notifications, executing an AWS Lambda function, or any other configured actions.
• Once the actions are performed, it is the responsibility of the application or system logic to reset the alarm to its normal state.
• If the application or system logic does not properly handle resetting the alarm, it can remain in the ALARM state indefinitely, resulting in the alarm constantly being triggered.
• It is important to ensure that the actions performed by the alarm include the necessary steps to reset the alarm once the issue or condition that triggered the alarm has been resolved.
• This ensures that the alarm transitions from the ALARM state back to its normal state, indicating that the condition being monitored is no longer a cause for concern.
• If the alarm is not properly reset, it will continue to evaluate the metrics against the configured thresholds and remain in the ALARM state even after the issue has been resolved.

Option A: Alarms continue to evaluate metrics against configured thresholds, even after they are triggered.

This option is not accurate because once an alarm is triggered in CloudWatch and enters the ALARM state, it does not continue to evaluate metrics against the configured thresholds. It remains in the ALARM state until it is reset.

Option B: After alarms are triggered, they remain in the ALARM state until they are manually disabled.

This option is not accurate because alarms do not remain in the ALARM state until they are manually disabled. They transition back to their normal state once the issue is resolved and the alarm is reset.

Option D: The alarm is not receiving appropriate metrics.

This option is not accurate because if the alarm is not receiving appropriate metrics, it would not constantly be in the ALARM state. It would either not trigger at all or not trigger consistently.

In summary, the most likely reason for a CloudWatch alarm constantly being in the ALARM state is that the application or system logic is not properly resetting the alarm after it has been triggered and actions have been performed.

Reference

• Using Amazon CloudWatch alarms – Amazon CloudWatch
• Create a CloudWatch alarm based on a static threshold – Amazon CloudWatch
• AWS::CloudWatch::Alarm – AWS CloudFormation (amazon.com)

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